Abstract

The optical transitions in quantum wells with the width varying from were studied by room temperature contactless electroreflectance (CER). In addition to the quantum well(QW) ground state transition , the and transitions (where denotes transition between the heavy hole and the electron subbands) have been clearly observed in CER spectra. The experimental QW transition energies were compared with theoretical predictions based on an effective mass formalism model. It has been concluded that this QW is type I for both electron and holes and the conduction band offset for the unstrained interface equals .